Bitflash: fair-launch release

Satoshi's bitcoin-0.1.0 reborn with RandomX CPU proof of work, anonymous .btf
addressing over Nostr with CGNAT rendezvous, automatic peer discovery, a
headless Linux node, and Windows GUI wallet. Fair launch, no premine, 21M cap.

1 files changed, 1361 insertions, 0 deletions

diff --git a/src/main.h b/src/main.h
new file mode 100644
index 0000000..a369476
--- /dev/null
+++ b/src/main.h
@@ -0,0 +1,1361 @@
+// Copyright (c) 2009 Satoshi Nakamoto
+// Distributed under the MIT/X11 software license, see the accompanying
+// file license.txt or http://www.opensource.org/licenses/mit-license.php.
+
+class COutPoint;
+class CInPoint;
+class CDiskTxPos;
+class CCoinBase;
+class CTxIn;
+class CTxOut;
+class CTransaction;
+class CBlock;
+class CBlockIndex;
+class CWalletTx;
+class CKeyItem;
+
+static const unsigned int MAX_SIZE = 0x02000000;
+static const int64 COIN = 100000000;
+// Total Bitflash emission: identical to Bitcoin (21 million).
+// MAX_MONEY guards against the value overflow bug (CVE-2010-5139), which in
+// 2010 allowed creating 184 billion coins in a single transaction.
+static const int64 MAX_MONEY = 21000000 * COIN;
+inline bool MoneyRange(int64 nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
+static const int64 CENT = 1000000;
+static const int COINBASE_MATURITY = 100;
+
+// Bitflash difficulty floor. The PoW is RandomX (memory-hard), ~1000x slower
+// per hash than SHA-256d, so the target is much easier than Bitcoin's to let a
+// CPU network start with little hashrate. Difficulty rises on its own (retarget
+// toward 10-min blocks) as miners join. This does NOT affect emission
+// (21 million, halving every 210,000 blocks). Tunable.
+static const CBigNum bnProofOfWorkLimit(~uint256(0) >> 12);
+
+
+
+
+
+
+extern CCriticalSection cs_main;
+extern map<uint256, CBlockIndex*> mapBlockIndex;
+extern uint256 hashGenesisBlock;
+extern uint256 hashGenesisMerkleRoot;
+extern unsigned int GENESIS_NONCE;
+extern CBlockIndex* pindexGenesisBlock;
+extern int nBestHeight;
+extern uint256 hashBestChain;
+extern CBlockIndex* pindexBest;
+extern unsigned int nTransactionsUpdated;
+extern string strSetDataDir;
+extern int nDropMessagesTest;
+extern bool fSoloMineTest; // /solomine: mine without requiring a peer (local test)
+
+// Settings
+extern int fGenerateBitcoins;
+extern int64 nTransactionFee;
+extern CAddress addrIncoming;
+
+
+
+
+
+
+
+string GetAppDir();
+FILE* OpenBlockFile(unsigned int nFile, unsigned int nBlockPos, const char* pszMode="rb");
+FILE* AppendBlockFile(unsigned int& nFileRet);
+bool AddKey(const CKey& key);
+vector<unsigned char> GenerateNewKey();
+bool AddToWallet(const CWalletTx& wtxIn);
+void ReacceptWalletTransactions();
+void RelayWalletTransactions();
+bool LoadBlockIndex(bool fAllowNew=true);
+void PrintBlockTree();
+bool BitcoinMiner();
+bool ProcessMessages(CNode* pfrom);
+bool ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv);
+bool SendMessages(CNode* pto);
+int64 GetBalance();
+bool CreateTransaction(CScript scriptPubKey, int64 nValue, CWalletTx& txNew, int64& nFeeRequiredRet);
+bool CommitTransactionSpent(const CWalletTx& wtxNew);
+bool SendMoney(CScript scriptPubKey, int64 nValue, CWalletTx& wtxNew);
+
+
+
+
+
+
+
+
+
+
+
+class CDiskTxPos
+{
+public:
+    unsigned int nFile;
+    unsigned int nBlockPos;
+    unsigned int nTxPos;
+
+    CDiskTxPos()
+    {
+        SetNull();
+    }
+
+    CDiskTxPos(unsigned int nFileIn, unsigned int nBlockPosIn, unsigned int nTxPosIn)
+    {
+        nFile = nFileIn;
+        nBlockPos = nBlockPosIn;
+        nTxPos = nTxPosIn;
+    }
+
+    IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
+    void SetNull() { nFile = -1; nBlockPos = 0; nTxPos = 0; }
+    bool IsNull() const { return (nFile == -1); }
+
+    friend bool operator==(const CDiskTxPos& a, const CDiskTxPos& b)
+    {
+        return (a.nFile     == b.nFile &&
+                a.nBlockPos == b.nBlockPos &&
+                a.nTxPos    == b.nTxPos);
+    }
+
+    friend bool operator!=(const CDiskTxPos& a, const CDiskTxPos& b)
+    {
+        return !(a == b);
+    }
+
+    string ToString() const
+    {
+        if (IsNull())
+            return strprintf("null");
+        else
+            return strprintf("(nFile=%d, nBlockPos=%d, nTxPos=%d)", nFile, nBlockPos, nTxPos);
+    }
+
+    void print() const
+    {
+        printf("%s", ToString().c_str());
+    }
+};
+
+
+
+
+class CInPoint
+{
+public:
+    CTransaction* ptx;
+    unsigned int n;
+
+    CInPoint() { SetNull(); }
+    CInPoint(CTransaction* ptxIn, unsigned int nIn) { ptx = ptxIn; n = nIn; }
+    void SetNull() { ptx = NULL; n = -1; }
+    bool IsNull() const { return (ptx == NULL && n == -1); }
+};
+
+
+
+
+class COutPoint
+{
+public:
+    uint256 hash;
+    unsigned int n;
+
+    COutPoint() { SetNull(); }
+    COutPoint(uint256 hashIn, unsigned int nIn) { hash = hashIn; n = nIn; }
+    IMPLEMENT_SERIALIZE( READWRITE(FLATDATA(*this)); )
+    void SetNull() { hash = 0; n = -1; }
+    bool IsNull() const { return (hash == 0 && n == -1); }
+
+    friend bool operator<(const COutPoint& a, const COutPoint& b)
+    {
+        return (a.hash < b.hash || (a.hash == b.hash && a.n < b.n));
+    }
+
+    friend bool operator==(const COutPoint& a, const COutPoint& b)
+    {
+        return (a.hash == b.hash && a.n == b.n);
+    }
+
+    friend bool operator!=(const COutPoint& a, const COutPoint& b)
+    {
+        return !(a == b);
+    }
+
+    string ToString() const
+    {
+        return strprintf("COutPoint(%s, %d)", hash.ToString().substr(0,6).c_str(), n);
+    }
+
+    void print() const
+    {
+        printf("%s\n", ToString().c_str());
+    }
+};
+
+
+
+
+//
+// An input of a transaction.  It contains the location of the previous
+// transaction's output that it claims and a signature that matches the
+// output's public key.
+//
+class CTxIn
+{
+public:
+    COutPoint prevout;
+    CScript scriptSig;
+    unsigned int nSequence;
+
+    CTxIn()
+    {
+        nSequence = UINT_MAX;
+    }
+
+    explicit CTxIn(COutPoint prevoutIn, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=UINT_MAX)
+    {
+        prevout = prevoutIn;
+        scriptSig = scriptSigIn;
+        nSequence = nSequenceIn;
+    }
+
+    CTxIn(uint256 hashPrevTx, unsigned int nOut, CScript scriptSigIn=CScript(), unsigned int nSequenceIn=UINT_MAX)
+    {
+        prevout = COutPoint(hashPrevTx, nOut);
+        scriptSig = scriptSigIn;
+        nSequence = nSequenceIn;
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(prevout);
+        READWRITE(scriptSig);
+        READWRITE(nSequence);
+    )
+
+    bool IsFinal() const
+    {
+        return (nSequence == UINT_MAX);
+    }
+
+    friend bool operator==(const CTxIn& a, const CTxIn& b)
+    {
+        return (a.prevout   == b.prevout &&
+                a.scriptSig == b.scriptSig &&
+                a.nSequence == b.nSequence);
+    }
+
+    friend bool operator!=(const CTxIn& a, const CTxIn& b)
+    {
+        return !(a == b);
+    }
+
+    string ToString() const
+    {
+        string str;
+        str += strprintf("CTxIn(");
+        str += prevout.ToString();
+        if (prevout.IsNull())
+            str += strprintf(", coinbase %s", HexStr(scriptSig.begin(), scriptSig.end(), false).c_str());
+        else
+            str += strprintf(", scriptSig=%s", scriptSig.ToString().substr(0,24).c_str());
+        if (nSequence != UINT_MAX)
+            str += strprintf(", nSequence=%u", nSequence);
+        str += ")";
+        return str;
+    }
+
+    void print() const
+    {
+        printf("%s\n", ToString().c_str());
+    }
+
+    bool IsMine() const;
+    int64 GetDebit() const;
+};
+
+
+
+
+//
+// An output of a transaction.  It contains the public key that the next input
+// must be able to sign with to claim it.
+//
+class CTxOut
+{
+public:
+    int64 nValue;
+    CScript scriptPubKey;
+
+public:
+    CTxOut()
+    {
+        SetNull();
+    }
+
+    CTxOut(int64 nValueIn, CScript scriptPubKeyIn)
+    {
+        nValue = nValueIn;
+        scriptPubKey = scriptPubKeyIn;
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(nValue);
+        READWRITE(scriptPubKey);
+    )
+
+    void SetNull()
+    {
+        nValue = -1;
+        scriptPubKey.clear();
+    }
+
+    bool IsNull()
+    {
+        return (nValue == -1);
+    }
+
+    uint256 GetHash() const
+    {
+        return SerializeHash(*this);
+    }
+
+    bool IsMine() const
+    {
+        return ::IsMine(scriptPubKey);
+    }
+
+    int64 GetCredit() const
+    {
+        if (IsMine())
+            return nValue;
+        return 0;
+    }
+
+    friend bool operator==(const CTxOut& a, const CTxOut& b)
+    {
+        return (a.nValue       == b.nValue &&
+                a.scriptPubKey == b.scriptPubKey);
+    }
+
+    friend bool operator!=(const CTxOut& a, const CTxOut& b)
+    {
+        return !(a == b);
+    }
+
+    string ToString() const
+    {
+        if (scriptPubKey.size() < 6)
+            return "CTxOut(error)";
+        return strprintf("CTxOut(nValue=%I64d.%08I64d, scriptPubKey=%s)", nValue / COIN, nValue % COIN, scriptPubKey.ToString().substr(0,24).c_str());
+    }
+
+    void print() const
+    {
+        printf("%s\n", ToString().c_str());
+    }
+};
+
+
+
+
+//
+// The basic transaction that is broadcasted on the network and contained in
+// blocks.  A transaction can contain multiple inputs and outputs.
+//
+class CTransaction
+{
+public:
+    int nVersion;
+    vector<CTxIn> vin;
+    vector<CTxOut> vout;
+    int nLockTime;
+
+
+    CTransaction()
+    {
+        SetNull();
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(this->nVersion);
+        nVersion = this->nVersion;
+        READWRITE(vin);
+        READWRITE(vout);
+        READWRITE(nLockTime);
+    )
+
+    void SetNull()
+    {
+        nVersion = 1;
+        vin.clear();
+        vout.clear();
+        nLockTime = 0;
+    }
+
+    bool IsNull() const
+    {
+        return (vin.empty() && vout.empty());
+    }
+
+    uint256 GetHash() const
+    {
+        return SerializeHash(*this);
+    }
+
+    bool IsFinal() const
+    {
+        if (nLockTime == 0 || nLockTime < nBestHeight)
+            return true;
+        foreach(const CTxIn& txin, vin)
+            if (!txin.IsFinal())
+                return false;
+        return true;
+    }
+
+    bool IsNewerThan(const CTransaction& old) const
+    {
+        if (vin.size() != old.vin.size())
+            return false;
+        for (int i = 0; i < vin.size(); i++)
+            if (vin[i].prevout != old.vin[i].prevout)
+                return false;
+
+        bool fNewer = false;
+        unsigned int nLowest = UINT_MAX;
+        for (int i = 0; i < vin.size(); i++)
+        {
+            if (vin[i].nSequence != old.vin[i].nSequence)
+            {
+                if (vin[i].nSequence <= nLowest)
+                {
+                    fNewer = false;
+                    nLowest = vin[i].nSequence;
+                }
+                if (old.vin[i].nSequence < nLowest)
+                {
+                    fNewer = true;
+                    nLowest = old.vin[i].nSequence;
+                }
+            }
+        }
+        return fNewer;
+    }
+
+    bool IsCoinBase() const
+    {
+        return (vin.size() == 1 && vin[0].prevout.IsNull());
+    }
+
+    bool CheckTransaction() const
+    {
+        // Basic checks that don't depend on any context
+        if (vin.empty() || vout.empty())
+            return error("CTransaction::CheckTransaction() : vin or vout empty");
+
+        // Check for negative or overflow output values (CVE-2010-5139)
+        int64 nValueOut = 0;
+        foreach(const CTxOut& txout, vout)
+        {
+            if (txout.nValue < 0)
+                return error("CTransaction::CheckTransaction() : txout.nValue negative");
+            if (txout.nValue > MAX_MONEY)
+                return error("CTransaction::CheckTransaction() : txout.nValue too high");
+            nValueOut += txout.nValue;
+            if (!MoneyRange(nValueOut))
+                return error("CTransaction::CheckTransaction() : txout total out of range");
+        }
+
+        if (IsCoinBase())
+        {
+            if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
+                return error("CTransaction::CheckTransaction() : coinbase script size");
+        }
+        else
+        {
+            foreach(const CTxIn& txin, vin)
+                if (txin.prevout.IsNull())
+                    return error("CTransaction::CheckTransaction() : prevout is null");
+        }
+
+        // Check for duplicate inputs (a tx spending the same output twice)
+        set<COutPoint> vInOutPoints;
+        foreach(const CTxIn& txin, vin)
+        {
+            if (vInOutPoints.count(txin.prevout))
+                return error("CTransaction::CheckTransaction() : duplicate inputs");
+            vInOutPoints.insert(txin.prevout);
+        }
+
+        return true;
+    }
+
+    bool IsMine() const
+    {
+        foreach(const CTxOut& txout, vout)
+            if (txout.IsMine())
+                return true;
+        return false;
+    }
+
+    int64 GetDebit() const
+    {
+        int64 nDebit = 0;
+        foreach(const CTxIn& txin, vin)
+            nDebit += txin.GetDebit();
+        return nDebit;
+    }
+
+    int64 GetCredit() const
+    {
+        int64 nCredit = 0;
+        foreach(const CTxOut& txout, vout)
+            nCredit += txout.GetCredit();
+        return nCredit;
+    }
+
+    int64 GetValueOut() const
+    {
+        int64 nValueOut = 0;
+        foreach(const CTxOut& txout, vout)
+        {
+            if (txout.nValue < 0)
+                throw runtime_error("CTransaction::GetValueOut() : negative value");
+            if (txout.nValue > MAX_MONEY)
+                throw runtime_error("CTransaction::GetValueOut() : value too high");
+            nValueOut += txout.nValue;
+            if (!MoneyRange(nValueOut))
+                throw runtime_error("CTransaction::GetValueOut() : total out of range");
+        }
+        return nValueOut;
+    }
+
+    int64 GetMinFee(bool fDiscount=false) const
+    {
+        unsigned int nBytes = ::GetSerializeSize(*this, SER_NETWORK);
+        if (fDiscount && nBytes < 10000)
+            return 0;
+        return (1 + (int64)nBytes / 1000) * CENT;
+    }
+
+
+
+    bool ReadFromDisk(CDiskTxPos pos, FILE** pfileRet=NULL)
+    {
+        CAutoFile filein = OpenBlockFile(pos.nFile, 0, pfileRet ? "rb+" : "rb");
+        if (!filein)
+            return error("CTransaction::ReadFromDisk() : OpenBlockFile failed");
+
+        // Read transaction
+        if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
+            return error("CTransaction::ReadFromDisk() : fseek failed");
+        filein >> *this;
+
+        // Return file pointer
+        if (pfileRet)
+        {
+            if (fseek(filein, pos.nTxPos, SEEK_SET) != 0)
+                return error("CTransaction::ReadFromDisk() : second fseek failed");
+            *pfileRet = filein.release();
+        }
+        return true;
+    }
+
+
+    friend bool operator==(const CTransaction& a, const CTransaction& b)
+    {
+        return (a.nVersion  == b.nVersion &&
+                a.vin       == b.vin &&
+                a.vout      == b.vout &&
+                a.nLockTime == b.nLockTime);
+    }
+
+    friend bool operator!=(const CTransaction& a, const CTransaction& b)
+    {
+        return !(a == b);
+    }
+
+
+    string ToString() const
+    {
+        string str;
+        str += strprintf("CTransaction(hash=%s, ver=%d, vin.size=%d, vout.size=%d, nLockTime=%d)\n",
+            GetHash().ToString().substr(0,6).c_str(),
+            nVersion,
+            vin.size(),
+            vout.size(),
+            nLockTime);
+        for (int i = 0; i < vin.size(); i++)
+            str += "    " + vin[i].ToString() + "\n";
+        for (int i = 0; i < vout.size(); i++)
+            str += "    " + vout[i].ToString() + "\n";
+        return str;
+    }
+
+    void print() const
+    {
+        printf("%s", ToString().c_str());
+    }
+
+
+
+    bool DisconnectInputs(CTxDB& txdb);
+    bool ConnectInputs(CTxDB& txdb, map<uint256, CTxIndex>& mapTestPool, CDiskTxPos posThisTx, int nHeight, int64& nFees, bool fBlock, bool fMiner, int64 nMinFee=0);
+    bool ClientConnectInputs();
+
+    bool AcceptTransaction(CTxDB& txdb, bool fCheckInputs=true, bool* pfMissingInputs=NULL);
+
+    bool AcceptTransaction(bool fCheckInputs=true, bool* pfMissingInputs=NULL)
+    {
+        CTxDB txdb("r");
+        return AcceptTransaction(txdb, fCheckInputs, pfMissingInputs);
+    }
+
+protected:
+    bool AddToMemoryPool();
+public:
+    bool RemoveFromMemoryPool();
+};
+
+
+
+
+
+//
+// A transaction with a merkle branch linking it to the block chain
+//
+class CMerkleTx : public CTransaction
+{
+public:
+    uint256 hashBlock;
+    vector<uint256> vMerkleBranch;
+    int nIndex;
+
+    // memory only
+    mutable bool fMerkleVerified;
+
+
+    CMerkleTx()
+    {
+        Init();
+    }
+
+    CMerkleTx(const CTransaction& txIn) : CTransaction(txIn)
+    {
+        Init();
+    }
+
+    void Init()
+    {
+        hashBlock = 0;
+        nIndex = -1;
+        fMerkleVerified = false;
+    }
+
+    int64 GetCredit() const
+    {
+        // Must wait until coinbase is safely deep enough in the chain before valuing it
+        if (IsCoinBase() && GetBlocksToMaturity() > 0)
+            return 0;
+        return CTransaction::GetCredit();
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        nSerSize += SerReadWrite(s, *(CTransaction*)this, nType, nVersion, ser_action);
+        nVersion = this->nVersion;
+        READWRITE(hashBlock);
+        READWRITE(vMerkleBranch);
+        READWRITE(nIndex);
+    )
+
+
+    int SetMerkleBranch(const CBlock* pblock=NULL);
+    int GetDepthInMainChain() const;
+    bool IsInMainChain() const { return GetDepthInMainChain() > 0; }
+    int GetBlocksToMaturity() const;
+    bool AcceptTransaction(CTxDB& txdb, bool fCheckInputs=true);
+    bool AcceptTransaction() { CTxDB txdb("r"); return AcceptTransaction(txdb); }
+};
+
+
+
+
+//
+// A transaction with a bunch of additional info that only the owner cares
+// about.  It includes any unrecorded transactions needed to link it back
+// to the block chain.
+//
+class CWalletTx : public CMerkleTx
+{
+public:
+    vector<CMerkleTx> vtxPrev;
+    map<string, string> mapValue;
+    vector<pair<string, string> > vOrderForm;
+    unsigned int fTimeReceivedIsTxTime;
+    unsigned int nTimeReceived;  // time received by this node
+    char fFromMe;
+    char fSpent;
+    //// probably need to sign the order info so know it came from payer
+
+    // memory only
+    mutable unsigned int nTimeDisplayed;
+
+
+    CWalletTx()
+    {
+        Init();
+    }
+
+    CWalletTx(const CMerkleTx& txIn) : CMerkleTx(txIn)
+    {
+        Init();
+    }
+
+    CWalletTx(const CTransaction& txIn) : CMerkleTx(txIn)
+    {
+        Init();
+    }
+
+    void Init()
+    {
+        fTimeReceivedIsTxTime = false;
+        nTimeReceived = 0;
+        fFromMe = false;
+        fSpent = false;
+        nTimeDisplayed = 0;
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        nSerSize += SerReadWrite(s, *(CMerkleTx*)this, nType, nVersion, ser_action);
+        nVersion = this->nVersion;
+        READWRITE(vtxPrev);
+        READWRITE(mapValue);
+        READWRITE(vOrderForm);
+        READWRITE(fTimeReceivedIsTxTime);
+        READWRITE(nTimeReceived);
+        READWRITE(fFromMe);
+        READWRITE(fSpent);
+    )
+
+    bool WriteToDisk()
+    {
+        return CWalletDB().WriteTx(GetHash(), *this);
+    }
+
+
+    int64 GetTxTime() const;
+
+    void AddSupportingTransactions(CTxDB& txdb);
+
+    bool AcceptWalletTransaction(CTxDB& txdb, bool fCheckInputs=true);
+    bool AcceptWalletTransaction() { CTxDB txdb("r"); return AcceptWalletTransaction(txdb); }
+
+    void RelayWalletTransaction(CTxDB& txdb);
+    void RelayWalletTransaction() { CTxDB txdb("r"); RelayWalletTransaction(txdb); }
+};
+
+
+
+
+//
+// A txdb record that contains the disk location of a transaction and the
+// locations of transactions that spend its outputs.  vSpent is really only
+// used as a flag, but having the location is very helpful for debugging.
+//
+class CTxIndex
+{
+public:
+    CDiskTxPos pos;
+    vector<CDiskTxPos> vSpent;
+
+    CTxIndex()
+    {
+        SetNull();
+    }
+
+    CTxIndex(const CDiskTxPos& posIn, unsigned int nOutputs)
+    {
+        pos = posIn;
+        vSpent.resize(nOutputs);
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        if (!(nType & SER_GETHASH))
+            READWRITE(nVersion);
+        READWRITE(pos);
+        READWRITE(vSpent);
+    )
+
+    void SetNull()
+    {
+        pos.SetNull();
+        vSpent.clear();
+    }
+
+    bool IsNull()
+    {
+        return pos.IsNull();
+    }
+
+    friend bool operator==(const CTxIndex& a, const CTxIndex& b)
+    {
+        if (a.pos != b.pos || a.vSpent.size() != b.vSpent.size())
+            return false;
+        for (int i = 0; i < a.vSpent.size(); i++)
+            if (a.vSpent[i] != b.vSpent[i])
+                return false;
+        return true;
+    }
+
+    friend bool operator!=(const CTxIndex& a, const CTxIndex& b)
+    {
+        return !(a == b);
+    }
+};
+
+
+
+
+
+//
+// Nodes collect new transactions into a block, hash them into a hash tree,
+// and scan through nonce values to make the block's hash satisfy proof-of-work
+// requirements.  When they solve the proof-of-work, they broadcast the block
+// to everyone and the block is added to the block chain.  The first transaction
+// in the block is a special one that creates a new coin owned by the creator
+// of the block.
+//
+// Blocks are appended to blk0001.dat files on disk.  Their location on disk
+// is indexed by CBlockIndex objects in memory.
+//
+class CBlock
+{
+public:
+    // header
+    int nVersion;
+    uint256 hashPrevBlock;
+    uint256 hashMerkleRoot;
+    unsigned int nTime;
+    unsigned int nBits;
+    unsigned int nNonce;
+
+    // network and disk
+    vector<CTransaction> vtx;
+
+    // memory only
+    mutable vector<uint256> vMerkleTree;
+
+
+    CBlock()
+    {
+        SetNull();
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        READWRITE(this->nVersion);
+        nVersion = this->nVersion;
+        READWRITE(hashPrevBlock);
+        READWRITE(hashMerkleRoot);
+        READWRITE(nTime);
+        READWRITE(nBits);
+        READWRITE(nNonce);
+
+        // ConnectBlock depends on vtx being last so it can calculate offset
+        if (!(nType & (SER_GETHASH|SER_BLOCKHEADERONLY)))
+            READWRITE(vtx);
+        else if (fRead)
+            const_cast<CBlock*>(this)->vtx.clear();
+    )
+
+    void SetNull()
+    {
+        nVersion = 1;
+        hashPrevBlock = 0;
+        hashMerkleRoot = 0;
+        nTime = 0;
+        nBits = 0;
+        nNonce = 0;
+        vtx.clear();
+        vMerkleTree.clear();
+    }
+
+    bool IsNull() const
+    {
+        return (nBits == 0);
+    }
+
+    uint256 GetHash() const
+    {
+        // Block IDENTITY hash (SHA-256d), used for indexing.
+        return Hash(BEGIN(nVersion), END(nNonce));
+    }
+
+    uint256 GetPoWHash() const
+    {
+        // Memory-hard PROOF-OF-WORK hash (RandomX) over the 80-byte header.
+        // This is the one that must be <= target (nBits).
+        return RandomXPoWHash((const void*)BEGIN(nVersion), END(nNonce) - BEGIN(nVersion));
+    }
+
+
+    uint256 BuildMerkleTree() const
+    {
+        vMerkleTree.clear();
+        foreach(const CTransaction& tx, vtx)
+            vMerkleTree.push_back(tx.GetHash());
+        int j = 0;
+        for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
+        {
+            for (int i = 0; i < nSize; i += 2)
+            {
+                int i2 = min(i+1, nSize-1);
+                vMerkleTree.push_back(Hash(BEGIN(vMerkleTree[j+i]),  END(vMerkleTree[j+i]),
+                                           BEGIN(vMerkleTree[j+i2]), END(vMerkleTree[j+i2])));
+            }
+            j += nSize;
+        }
+        return (vMerkleTree.empty() ? 0 : vMerkleTree.back());
+    }
+
+    vector<uint256> GetMerkleBranch(int nIndex) const
+    {
+        if (vMerkleTree.empty())
+            BuildMerkleTree();
+        vector<uint256> vMerkleBranch;
+        int j = 0;
+        for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2)
+        {
+            int i = min(nIndex^1, nSize-1);
+            vMerkleBranch.push_back(vMerkleTree[j+i]);
+            nIndex >>= 1;
+            j += nSize;
+        }
+        return vMerkleBranch;
+    }
+
+    static uint256 CheckMerkleBranch(uint256 hash, const vector<uint256>& vMerkleBranch, int nIndex)
+    {
+        if (nIndex == -1)
+            return 0;
+        foreach(const uint256& otherside, vMerkleBranch)
+        {
+            if (nIndex & 1)
+                hash = Hash(BEGIN(otherside), END(otherside), BEGIN(hash), END(hash));
+            else
+                hash = Hash(BEGIN(hash), END(hash), BEGIN(otherside), END(otherside));
+            nIndex >>= 1;
+        }
+        return hash;
+    }
+
+
+    bool WriteToDisk(bool fWriteTransactions, unsigned int& nFileRet, unsigned int& nBlockPosRet)
+    {
+        // Open history file to append
+        CAutoFile fileout = AppendBlockFile(nFileRet);
+        if (!fileout)
+            return error("CBlock::WriteToDisk() : AppendBlockFile failed");
+        if (!fWriteTransactions)
+            fileout.nType |= SER_BLOCKHEADERONLY;
+
+        // Write index header
+        unsigned int nSize = fileout.GetSerializeSize(*this);
+        fileout << FLATDATA(pchMessageStart) << nSize;
+
+        // Write block
+        nBlockPosRet = ftell(fileout);
+        if (nBlockPosRet == -1)
+            return error("CBlock::WriteToDisk() : ftell failed");
+        fileout << *this;
+
+        return true;
+    }
+
+    bool ReadFromDisk(unsigned int nFile, unsigned int nBlockPos, bool fReadTransactions)
+    {
+        SetNull();
+
+        // Open history file to read
+        CAutoFile filein = OpenBlockFile(nFile, nBlockPos, "rb");
+        if (!filein)
+            return error("CBlock::ReadFromDisk() : OpenBlockFile failed");
+        if (!fReadTransactions)
+            filein.nType |= SER_BLOCKHEADERONLY;
+
+        // Read block
+        filein >> *this;
+
+        // Check the header
+        if (CBigNum().SetCompact(nBits) > bnProofOfWorkLimit)
+            return error("CBlock::ReadFromDisk() : nBits errors in block header");
+        // NOTE: the proof of work is RandomX (GetPoWHash), validated once by
+        // CheckBlock when the block is accepted. Re-checking it on every disk
+        // read would be prohibitively slow, and checking the SHA-256d GetHash()
+        // here (a leftover from Bitcoin) is simply wrong for a RandomX chain.
+
+        return true;
+    }
+
+
+
+    void print() const
+    {
+        printf("CBlock(hash=%s, ver=%d, hashPrevBlock=%s, hashMerkleRoot=%s, nTime=%u, nBits=%08x, nNonce=%u, vtx=%d)\n",
+            GetHash().ToString().substr(0,14).c_str(),
+            nVersion,
+            hashPrevBlock.ToString().substr(0,14).c_str(),
+            hashMerkleRoot.ToString().substr(0,6).c_str(),
+            nTime, nBits, nNonce,
+            vtx.size());
+        for (int i = 0; i < vtx.size(); i++)
+        {
+            printf("  ");
+            vtx[i].print();
+        }
+        printf("  vMerkleTree: ");
+        for (int i = 0; i < vMerkleTree.size(); i++)
+            printf("%s ", vMerkleTree[i].ToString().substr(0,6).c_str());
+        printf("\n");
+    }
+
+
+    int64 GetBlockValue(int64 nFees) const;
+    bool DisconnectBlock(CTxDB& txdb, CBlockIndex* pindex);
+    bool ConnectBlock(CTxDB& txdb, CBlockIndex* pindex);
+    bool ReadFromDisk(const CBlockIndex* blockindex, bool fReadTransactions);
+    bool AddToBlockIndex(unsigned int nFile, unsigned int nBlockPos);
+    bool CheckBlock() const;
+    bool AcceptBlock();
+};
+
+
+
+
+
+
+//
+// The block chain is a tree shaped structure starting with the
+// genesis block at the root, with each block potentially having multiple
+// candidates to be the next block.  pprev and pnext link a path through the
+// main/longest chain.  A blockindex may have multiple pprev pointing back
+// to it, but pnext will only point forward to the longest branch, or will
+// be null if the block is not part of the longest chain.
+//
+class CBlockIndex
+{
+public:
+    const uint256* phashBlock;
+    CBlockIndex* pprev;
+    CBlockIndex* pnext;
+    unsigned int nFile;
+    unsigned int nBlockPos;
+    int nHeight;
+
+    // block header
+    int nVersion;
+    uint256 hashMerkleRoot;
+    unsigned int nTime;
+    unsigned int nBits;
+    unsigned int nNonce;
+
+
+    CBlockIndex()
+    {
+        phashBlock = NULL;
+        pprev = NULL;
+        pnext = NULL;
+        nFile = 0;
+        nBlockPos = 0;
+        nHeight = 0;
+
+        nVersion       = 0;
+        hashMerkleRoot = 0;
+        nTime          = 0;
+        nBits          = 0;
+        nNonce         = 0;
+    }
+
+    CBlockIndex(unsigned int nFileIn, unsigned int nBlockPosIn, CBlock& block)
+    {
+        phashBlock = NULL;
+        pprev = NULL;
+        pnext = NULL;
+        nFile = nFileIn;
+        nBlockPos = nBlockPosIn;
+        nHeight = 0;
+
+        nVersion       = block.nVersion;
+        hashMerkleRoot = block.hashMerkleRoot;
+        nTime          = block.nTime;
+        nBits          = block.nBits;
+        nNonce         = block.nNonce;
+    }
+
+    uint256 GetBlockHash() const
+    {
+        return *phashBlock;
+    }
+
+    bool IsInMainChain() const
+    {
+        return (pnext || this == pindexBest);
+    }
+
+    bool EraseBlockFromDisk()
+    {
+        // Open history file
+        CAutoFile fileout = OpenBlockFile(nFile, nBlockPos, "rb+");
+        if (!fileout)
+            return false;
+
+        // Overwrite with empty null block
+        CBlock block;
+        block.SetNull();
+        fileout << block;
+
+        return true;
+    }
+
+    enum { nMedianTimeSpan=11 };
+
+    int64 GetMedianTimePast() const
+    {
+        unsigned int pmedian[nMedianTimeSpan];
+        unsigned int* pbegin = &pmedian[nMedianTimeSpan];
+        unsigned int* pend = &pmedian[nMedianTimeSpan];
+
+        const CBlockIndex* pindex = this;
+        for (int i = 0; i < nMedianTimeSpan && pindex; i++, pindex = pindex->pprev)
+            *(--pbegin) = pindex->nTime;
+
+        sort(pbegin, pend);
+        return pbegin[(pend - pbegin)/2];
+    }
+
+    int64 GetMedianTime() const
+    {
+        const CBlockIndex* pindex = this;
+        for (int i = 0; i < nMedianTimeSpan/2; i++)
+        {
+            if (!pindex->pnext)
+                return nTime;
+            pindex = pindex->pnext;
+        }
+        return pindex->GetMedianTimePast();
+    }
+
+
+
+    string ToString() const
+    {
+        return strprintf("CBlockIndex(nprev=%08x, pnext=%08x, nFile=%d, nBlockPos=%-6d nHeight=%d, merkle=%s, hashBlock=%s)",
+            pprev, pnext, nFile, nBlockPos, nHeight,
+            hashMerkleRoot.ToString().substr(0,6).c_str(),
+            GetBlockHash().ToString().substr(0,14).c_str());
+    }
+
+    void print() const
+    {
+        printf("%s\n", ToString().c_str());
+    }
+};
+
+
+
+//
+// Used to marshal pointers into hashes for db storage.
+//
+class CDiskBlockIndex : public CBlockIndex
+{
+public:
+    uint256 hashPrev;
+    uint256 hashNext;
+
+    CDiskBlockIndex()
+    {
+        hashPrev = 0;
+        hashNext = 0;
+    }
+
+    explicit CDiskBlockIndex(CBlockIndex* pindex) : CBlockIndex(*pindex)
+    {
+        hashPrev = (pprev ? pprev->GetBlockHash() : 0);
+        hashNext = (pnext ? pnext->GetBlockHash() : 0);
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        if (!(nType & SER_GETHASH))
+            READWRITE(nVersion);
+
+        READWRITE(hashNext);
+        READWRITE(nFile);
+        READWRITE(nBlockPos);
+        READWRITE(nHeight);
+
+        // block header
+        READWRITE(this->nVersion);
+        READWRITE(hashPrev);
+        READWRITE(hashMerkleRoot);
+        READWRITE(nTime);
+        READWRITE(nBits);
+        READWRITE(nNonce);
+    )
+
+    uint256 GetBlockHash() const
+    {
+        CBlock block;
+        block.nVersion        = nVersion;
+        block.hashPrevBlock   = hashPrev;
+        block.hashMerkleRoot  = hashMerkleRoot;
+        block.nTime           = nTime;
+        block.nBits           = nBits;
+        block.nNonce          = nNonce;
+        return block.GetHash();
+    }
+
+
+    string ToString() const
+    {
+        string str = "CDiskBlockIndex(";
+        str += CBlockIndex::ToString();
+        str += strprintf("\n                hashBlock=%s, hashPrev=%s, hashNext=%s)",
+            GetBlockHash().ToString().c_str(),
+            hashPrev.ToString().substr(0,14).c_str(),
+            hashNext.ToString().substr(0,14).c_str());
+        return str;
+    }
+
+    void print() const
+    {
+        printf("%s\n", ToString().c_str());
+    }
+};
+
+
+
+
+
+
+
+
+//
+// Describes a place in the block chain to another node such that if the
+// other node doesn't have the same branch, it can find a recent common trunk.
+// The further back it is, the further before the fork it may be.
+//
+class CBlockLocator
+{
+protected:
+    vector<uint256> vHave;
+public:
+
+    CBlockLocator()
+    {
+    }
+
+    explicit CBlockLocator(const CBlockIndex* pindex)
+    {
+        Set(pindex);
+    }
+
+    explicit CBlockLocator(uint256 hashBlock)
+    {
+        map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
+        if (mi != mapBlockIndex.end())
+            Set((*mi).second);
+    }
+
+    IMPLEMENT_SERIALIZE
+    (
+        if (!(nType & SER_GETHASH))
+            READWRITE(nVersion);
+        READWRITE(vHave);
+    )
+
+    void Set(const CBlockIndex* pindex)
+    {
+        vHave.clear();
+        int nStep = 1;
+        while (pindex)
+        {
+            vHave.push_back(pindex->GetBlockHash());
+
+            // Exponentially larger steps back
+            for (int i = 0; pindex && i < nStep; i++)
+                pindex = pindex->pprev;
+            if (vHave.size() > 10)
+                nStep *= 2;
+        }
+        vHave.push_back(hashGenesisBlock);
+    }
+
+    CBlockIndex* GetBlockIndex()
+    {
+        // Find the first block the caller has in the main chain
+        foreach(const uint256& hash, vHave)
+        {
+            map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
+            if (mi != mapBlockIndex.end())
+            {
+                CBlockIndex* pindex = (*mi).second;
+                if (pindex->IsInMainChain())
+                    return pindex;
+            }
+        }
+        return pindexGenesisBlock;
+    }
+
+    uint256 GetBlockHash()
+    {
+        // Find the first block the caller has in the main chain
+        foreach(const uint256& hash, vHave)
+        {
+            map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hash);
+            if (mi != mapBlockIndex.end())
+            {
+                CBlockIndex* pindex = (*mi).second;
+                if (pindex->IsInMainChain())
+                    return hash;
+            }
+        }
+        return hashGenesisBlock;
+    }
+
+    int GetHeight()
+    {
+        CBlockIndex* pindex = GetBlockIndex();
+        if (!pindex)
+            return 0;
+        return pindex->nHeight;
+    }
+};
+
+
+
+
+
+
+
+
+
+
+
+
+extern map<uint256, CTransaction> mapTransactions;
+extern map<uint256, CWalletTx> mapWallet;
+extern vector<pair<uint256, bool> > vWalletUpdated;
+extern CCriticalSection cs_mapWallet;
+extern map<vector<unsigned char>, CPrivKey> mapKeys;
+extern map<uint160, vector<unsigned char> > mapPubKeys;
+extern CCriticalSection cs_mapKeys;
+extern CKey keyUser;